Also, China will never allow the US or South Korea to overthrow North Korea. The only state that can do that is China. The main reason is the North Korean/Chinese border, and the threat that a war would create millions of hungry Koreans fleeing across the border into China and deep-sixing the Chinese economy.
If Kim did get too out of control I'd expect a Chinese lead coup and a puppet government installation.
Also, let's face it, if North Korea was to reunite with South Korea it would completely wreck South Koreas economy. Just ask Catfish how difficult the reunification of Germany was. This would be a million times worse.
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